The mortal Luo Jiuqiu, the fox demon Hu Li, and the coward Zhao Jincai run a supernatural agency that is full of black and white. One day, an incident of evil spirits hurting people occurred in the city. At the same time, Luo Jiuqiu picked up a mysterious amnesia man outside the office. Everyone thought he was one of the victims of the evil ghost injury incident, so they temporarily took him in. Luo Jiuqiu named him Luo Er. During the investigation of the case, Luo Er showed a series of Taoist abilities and helped Luo Jiuqiu and the others solve the case. Although the incident ended perfectly, Luo Er never recovered his memory, so he joined the firm as a matter of course. But this year, weird cases have happened again and again. People went deep behind the cases and found that they were inextricably linked. It seemed that the world could not escape this disaster...